xref: /freebsd/usr.sbin/usbdump/usbdump.8 (revision 6b436e625295276132a7e08a95eb5dafcde82a62)

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.\" Copyright (c) 2010 Weongyo Jeong.
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.\" $FreeBSD$
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.Dd May 31, 2011
.Dt USBDUMP 8
.Os
.Sh NAME
.Nm usbdump
.Nd "dump traffic on USB host controller"
.Sh SYNOPSIS
.Nm
.Op Fl i Ar ifname
.Op Fl r Ar file
.Op Fl s Ar snaplen
.Op Fl v
.Op Fl w Ar file
.Sh DESCRIPTION
The
.Nm
utility provides a way to dump USB packets on host controllers.
.Pp
The following options are accepted:
.Bl -tag -width ".Fl f Ar file"
.It Fl i Ar ifname
Listen on USB bus interface
.Ar ifname .
.It Fl r Ar file
Read the raw packets from
.Ar file .
.It Fl s Ar snaplen
Snapshot
.Ar snaplen
bytes from each packet.
.It Fl v
Enable debugging messages.
When defined multiple times the verbosity level increases.
.It Fl w Ar file
Write the raw packets to
.Ar file .
.El
.Sh EXAMPLES
Capture the USB raw packets on usbus2:
.Pp
.Dl "usbdump -i usbus2 -s 256 -v"
.Pp
Dump the USB raw packets of usbus2 into the file without packet
size limit:
.Pp
.Dl "usbdump -i usbus2 -s 0 -w /tmp/dump_pkts"
.Pp
Read and display the USB raw packets from previous file:
.Pp
.Dl "usbdump -r /tmp/dump_pkts -v"
.Sh OUTPUT FORMAT
The output format of
.Nm
is as follows:
.Pp
.Dl "<time> <bus>.<addr> <ep> <xfertype> <S/D> (<frames>/<length>) <...>"
.Pp
The meaning of the output format elements is as follows:
.Bl -tag -width "<xfertype>"
.It <time>
A timestamp preceding all output lines.
The timestamp has the format "hh:mm:ss.frac" and is as accurate as
the kernel's clock.
.It <bus>
The USB host controller's bus unit number.
.It <addr>
The unique number of the USB device as allocated by the host controller driver.
.It <ep>
The USB endpoint address that indicates whether the address is
.Dv OUT
or
.Dv IN .
.It <xfertype>
The USB transfer type.
Can be
.Dv CTRL ,
.Dv ISOC ,
.Dv BULK
or
.Dv INTR .
.It <S/D>
`S' indicates a USB submit.
`D' indicates a USB transfer done.
.It <frames>
Numbers of frames in this packets.
If this is a USB submit, its value is
.Li xfer->nframes
which means how many frames are acceptable or registered to transfer.
If this is a USB done,
.Li xfer->aframes
is the actual number of frames.
.It <length>
Total packet size.
If this is a USB submit, its value is
.Li xfer->sumlen .
If this is a USB done, its value is
.Li xfer->actlen .
.It <...>
Optional field used for printing an error string if the packet is from USB done.
.El
.Sh SEE ALSO
.Xr usbconfig 8
.Sh AUTHORS
.An Weongyo Jeong
.Aq weongyo@FreeBSD.org